All fire-rated doors are required to be labeled as such. Pella Entry Doors that are fire-rated will have two foil stickers. The first sticker is silver and is located on the frame or jamb. The second sticker will either be black or red depending on the minute rating. A 20-minute rated panel will have a black sticker and a 90-minute rated panel will have a red sticker.

Yes, you can reverse the slide of a patio door prior to the installation. The instructions to do this are included with every vinyl patio door. This option is not available on the vinyl patio doors with blinds-between-the-glass.
Please note: This cannot be done on wood sliding patio doors.

If your vinyl products are warped from the sun, there is not anything you can do to "straighten" them. As written on your product label, you should remove all packaging and store out of direct sunlight prior to installation.